Birth of the Byzantine Army breaks with the historiographical habit of studying the Romano-Byzantine army solely during Justinian's reign (527-565 CE) and neglecting the Eastern emperors who preceded him following the fall of the Western Empire in 476. This comprehensive study also encompasses the period up to the end of Heraclius' reign, the last soldier-emperor of the Late Roman tradition, in 641. By then, the Slavs had seized the Latin-speaking lands of the Balkans, while the Muslims had invaded Syria and Egypt. These two conquering peoples ushered in a new geopolitical era and deprived the imperial army of considerable resources. Constantinople had become fully Byzantium, and the Late Roman military tradition could not be upheld beyond this point. Over the course of these 165 years, the Romano-Byzantine army could not remain unchanged. In addition to traditional foes like the Persians and steppe horsemen, it also faced new challenges such as campaigns in North Africa, and also against the Vandals and the Ostrogoths. Ensnared by these new conquests, the imperial army of Byzantium was compelled to defend them against the Moors in Africa and the Lombards in Italy. Along the Danube border, it had to contain the Slavs and Avars, whose siege capabilities posed a threat to Byzantium itself. New organisation and tactics became necessary. Does this make it a Late Roman Army or a brand-new Byzantine one? That is the question! AUTHOR: The author is a specialist in military history and the author of eleven books and nearly 200 articles. His main subject of study is the late Roman army and the warriors of the early Middle Ages, but he also places himself in the broader perspective of comparative military history. A graduate of the regional sessions of the Hautes Etudes de l'Armement and of the Institut des Hautes Etudes de la Défense nationale (France), he has also been a member of the Scientific Committee of the Centre d'Histoire et de Prospective Militaires de Lausanne-Pully (Switzerland) and research director at the Institut für vergleichende Tactik in Vienna-Postdam (Austria-Germany). He regularly writes for the Revue Militaire Suisse for nearly three decades, and for three years has directed dissertations at the Ecole de Guerre (Paris). 16 b/w illustrations, 5 colour illustrations, 4 colour photos, 7 b/w maps, 8 tables, 3 graphs